Drilling-machine.



7 No. 744,397. 1 I PATENTED NOV. 17,-1903'.

G. B. PIGKOPP DRILLING MACHINE.

APPLICATION IILE DI'EB. 20, 1902. RENEWED 001.. 6, 1903. H0 H ODEL. 2 SHEETS-SHEET 1.

No. 744,397. I PAT'ENTED N0v'.17, 1903;

e. B, PIGKOP. l

DRILLING MACHINE. AIPLIOATION FILED FEB. 20. 1902 RENEWED 00T. 6,'1903.

UNITED STATES Patented November 17, 1903.

PATENT OFFICE.

GEORGE E. PIOKOP, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO P. & F.

' OORBIN, on NEW BRITAIN, CONN NEOTIOUT.

EOTICUT, A CORPORATION OF CON- DRILLINGI-MVACHINEQ SPECIFICATION forming part of Letters Patent No. 744,397, dated November 1'7, 1903.

' Application filed February 20, 1902. Renewed. Qotober 6, 1903. Serial No. 176,011. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE E. PICKOP, a. citizen of the United States, residing at New Britain, in the county of Hartford, State of Connecticut, have invented certain new and usefulImprovementsinDrilling-Machines,of which the following is a full, clear, and exact description.

My invention relates to improvements in drilling-machines.

- The object of my invention is to providea simple, inexpensive, efiective, and durable cast-off device whereby the work of the ma chine will be automatically checked in the event the drill is too dull to accomplish its function properly or in the event that the material to be bored is so hard as to endanger breakage.

In the drawings, Figure 1 is a side elevation. Fig. 2 is a relatively enlarged side elevation of the drilling mechanism, showing details of construction. Fig. 3 isa similar view illustrating the parts in a different position. Fig. Ais a plan View of the top of. the machine. Fig. 5 is a section on the line 6 6, Fig. 2.

A is a frame of suitable construction supporting a work-table B, which may in the particular form shown in Fig. 1 be moved up and down by means of a suitable cam O or other controller. The work-table B carries the work and in this particular form the work is fed up to the drill.

Dis the drill, carried in a suitable chuck D.

D is a drill-spindle, which bears at its upper end flanges forming an annular groove, into which head project one or more springpressed dogs E E.

E represents springs for causing the dogs to project inwardly and against the drill-spindle D The lowerfiange is preferably provided withya beveled surface D for the purpose hereinafter described. -Thesprings E are carried in a suitable head or frame E, which may be fixed upon a sleeve F,surrounding the drill-spindle D. This sleeve Fis attached to the said drill-spindle D by means of a pin D bearing in a slot F in said sleeve. The pin D and slot F permit the desired longitudinal independent action of the sleeve F and spindle D but splinethem in such a way that any rotative movement of one would .antifriction devices G G may be applied.

H is a spring bearing against the stationary part of the frame A at one end and against a ring H on the sleeve F. The pin D rests. on ring H, and the latter tends to normally elevate the said pin and said spindle D v I is a suitable wheel mounted upon the sleeve F and by which the sleeve and drill may be rotated.

The tension of the springs E may be varied in any well known wayfor example, by means of adjusting the heads E which heads may be changed-or modified in a variety of ways obvious to the'mechanic. The tension of the spring E determines the degree of pressure with which the dogs E engage the drillspindle D The lower side of thatportion of the dogs E E which engages the lower flange may be beveled, so that when the drill becomes dull or when the feed is too rapid or when the metal which it is desired to bore is too hard these dogs E E may be forced back and the drill-spindle will be forced upwardly under the influence of the spring H, the pin D riding up in the slot F. When the oper- 'ator has detected the cause of temporary failureof the drill to work, he remedies the fault, and then may depresss the drill-spindle until the'beveled surface Dcomes in contact with the dogs E, thus forcing said dogs backwardly until the annular groove lies opposite the dogs, whereupon the springs E will force the dogs ahead into said groove, and the said drill will be held down in the operative position until another emergency occurs. The degree of resistance or force necessary to unseat the dogs E may be varied to accord with the desired work. i

spindle D nevertheless another spline F may be employed, carried by the said sleeve and projecting into a suitable slot in the drillspindle. This is best seen in the sectional view, Fig. 5.

I claim- 1. In a drilling-machine, a drill-spindle, a work-support, means for moving one of said parts toward the other to effect a feed, said drill-spindle being mounted in a suitable rotary sleeve, means to prevent independent rotation of said sleeve relatively to'the drill, and means to permit independent longitudinal movement of the sleeve and drill-spindle, and a yielding detent to resist independent longitudinal movement of said parts adapted to automatically free itself for the purposes specified.

2. In a drilling-machine, a drill-spindle, a work-support, means for moving one of said parts toward the other to eifect a feed, said drill-spindle being mounted in a suitable rotary sleeve, means to prevent independent rotation of the sleeve relatively to the drill, and means to permit independent longitudinal movement of the sleeve and drill-spindle, and a yielding detent carried by said sleeve to resist independent longitudinal movement of said parts adapted to automatically free itself for the purpose specified.

3. In a drilling-machine, a drill-spindle, a sleeve surrounding the same and a spline between said sleeve and said spindle, one of said parts having longitudinal movement independent of the other, a spring-pressed detent to resist the independent movement of said parts when the same are in the operative position and adapted to automatically release said parts under certain conditions.

4. In a drilling-machine, a drill-spindle, a

work-support, means to move one of said parts toward or away from the other part to effect a feed, a rotatable sleeve carrying said drill-spindle, means to positively prevent independent rotative movement of said sleeve and spindle, and means to yieldingly resist independent longitudinal movement of said parts yet automatically freeing said parts when the drill encounters undue resistance.

5. In a drilling-machine, a drill-spindle, a supporting sleeve, a spline between said sleeve and spindle, a spring-pressed dog carried by one of said parts and frictionally engaging the other part and arranged to disengage said other part when the drill encounters undue resistance.

with said spindle and bearing in a groove inthe same, and means for varying the degree of frictional resistance between said dog and spindle, said frictional means automatically freeing said spindle when the drill encounters undue resistance.

Signed at New Britain, Connecticut, this 18th day of February, 1902.

GEORGE B. PICKOP.

Witnesses: Y

LAUREN M. BANCROFT, G. E. ROOT. 

